1. Representing Atoms We know how to use Bohr-Rutherford diagrams to represent atoms. BUT it is Bohring…it takes a lot of work to draw!

2. Lewis Structures Gilbert Newton Lewis suggested a short form only representing ‘ relevant ’ electrons. These electrons were identified as valence electrons.

3. Steps to Draw Lewis Structures Find out which group your element is in. This will tell you the number of valence electrons your element has. You will only draw the valence electrons.

4. Groups - Review Each element in a group has the same number of valence electrons. Except for He, it has 2 electrons

5. Lewis Structures 1) Write the element symbol. 2) Carbon is in the 4 th group, so it has 4 valence electrons. 3) Starting at the right, draw 4 electrons, or dots, counter- clockwise around the element symbol.

6. Lewis Structures 1) Check your work. 2) Using your periodic table, check that Carbon is in the 4 th group. 3) You should have 4 total electrons, or dots, drawn in for Carbon.

7. Lewis Structures On your hand out, try these elements on your own: a) H b) P c) Ca d) Ar e) Cl f) Al

8. Lewis Structures On your hand out, try these elements on your own: a) H b) P c) Ca d) Ar e) Cl f) Al

9. Lewis Structures On your hand out, try these elements on your own: a) H b) P c) Ca d) Ar e) Cl f) Al

10. Lewis Structures On your hand out, try these elements on your own: a) H b) P c) Ca d) Ar e) Cl f) Al

11. Lewis Structures On your hand out, try these elements on your own: a) H b) P c) Ca d) Ar e) Cl f) Al

12. Lewis Structures On your hand out, try these elements on your own: a) H b) P c) Ca d) Ar e) Cl f) Al

13. Lewis Structures On your hand out, try these elements on your own: a) H b) P c) Ca d) Ar e) Cl f) Al

14. Complete the Lewis Structure hand out You should know how to draw Lewis Structures for the first 20 elements.